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YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
Description
The YB1680 is a 1.5MHz constant
frequency, slope compensated current
mode PWM step-down converter. The
device integrates a main switch and a
synchronous rectifier for high efficiency
without an external Schottky diode. It is
ideal for powering portable equipment that
runs from a single cell lithium-Ion (Li+)
battery. The YB1680 can supply 600mA of
load current from a 2.5V to 5.5V input
voltage. The output voltage can be
regulated as low as 0.6V. The YB1680 can
also run at 100% duty cycle for low dropout
operation, extending battery life in portable
system. Idle mode operation at light loads
provides very low output ripple voltage for
noise sensitive applications.
The YB1680 is offered in a low profile 5-pin,
SOT package, and is available in an
adjustable version.
Features
„ High Efficiency : Up to 94%
„ 1.5MHz Constant Switching Frequency
„ 600mA Output Current at VIN=3V
„ Integrated Main Switch and Synchronous
Rectifier. No Schottky Diode Required
„ 2.5V to 5.5V Input Voltage Range
„ Output Voltage as Low as 0.6V
„ 100% Duty Cycle in Dropout
„ Low Quiescent Current : 300μA
„ Slope Compensated Current Mode
Control for Excellent Line and Load
Transient Response
„ Short Circuit Protection
„ Thermal Fault Protection
„ <1μA Shutdown Current
„ Space Saving 5-Pin SOT23 Package
„ Pb-free Package
Applications
„ Cellular and Smart Phones
„ Microprocessors and DSP Core Supplies
„ Wireless and DSL Modems
„ PDAs
„ MP3 Player
„ Digital Still and Video Cameras
„ Portable Instruments
Typical Application Circuit
Figure 1: Typical Application Circuit
YB1680 Rev.1.0
www.yobon.com.tw
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Pin Configuration
YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
EN 1
5 FB
GND 2
SW 3
4 VIN
SOT23-5
Figure 2: Pin Configuration
Pin Description
Table 1
Pin Name
Description
Regulator Enable control input. Drive EN above 1.5V to turn on the
1 EN part. Drive EN below 0.3V to turn it off. In shutdown, all functions are
disabled drawing <1μA supply current. Do not leave EN floating.
2 GND Ground.
Power Switch Output. It is the Switch note connection to Inductor. This
3 SW pin connects to the drains of the internal P-CH and N-CH MOSFET
switches.
4
VIN
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a
2.2μF or greater ceramic capacitor.
VFB (Adjustable Version) : Feedback Input Pin. Connect FB to the
5 FB center point of the external resistor divider. The feedback threshold
voltage is 0.6V.
Ordering Information
Order Number
Package Type
YB1680ST25XADJP
SOT23-5
Supplied As
3000 units Tape & Reel
Package Marking
A1XY (Note 1)
Note 1: XY = Manufacturing Date Code
YB1680 Rev.1.0
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YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
Absolute Maximum Ratings
Input Supply Voltage ................... -0.3V to 6V
EN, VFB Voltage ................ -0.3V to VIN+0.3V
SW, VOUT Voltage.............. -0.3V to VIN+0.3V
Peak SW Sink and Source Current........1.5A
Operating Temperature Range.. -40°C to 85°C
Junction Temperature ....................... 125°C
Storage Temperature Range ... -65°C to 150°C
Lead Temperature (Soldering, 10s) .. 300°C
Electrical Characteristics
Table 2 (VIN = VRUN = 3.6V, TA=25°C, Test Circuit Figure 1, unless otherwise noted.)
Description
Symbol
Test Conditions
MIN TYP
MAX Units
Input Voltage Range
Input DC Supply Current
Active Mode
Shutdown Mode
Regulated Feedback Voltage
VFB Input Bias Current
Reference Voltage Line
Regulation
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Output Current
Oscillator Frequency
RDS(ON) of P-CH MOSFET
RDS(ON) of N-CH MOSFET
Peak Inductor Current
VIN
IQ
VFB
IFB
FOSC
2.5 5.5 V
VFB = 0.5V
VFB = 0V, VIN = 4.2V
TA = +25
TA = 0℃ ≦ TA 85
TA = -40℃ ≦ TA 85
VFB = 0.65V
VFB = 2.5V to 5.5V,
VOUT = VFB (R2=0)
VIN = 2.5V to 5.5V, IOUT = 10mA
IOUT from 0 to 600mA
VIN = 3.0V
VFB = 0.6V or VOUT = 100%
ISW = 300mA
ISW = -300mA
VIN = 3V, VFB = 0.5V or
VOUT = 90%
Duty Cycle < 35%
0.5880
0.5865
0.5850
600
1.2
270
0.08
0.6000
0.6000
0.6000
0.11
0.11
0.0015
1.5
0.30
0.20
1.20
400
1.0
0.6120
0.6135
0.6150
±30
0.63
0.63
1.8
0.50
0.45
μA
V
nA
%/V
%/V
%/mA
mA
MHz
A
SW Leakage
VRUN = 0V, VSW = 0V or 5V,
VIN = 5V
±0.01 ±1
μA
Output Over Voltage Lockout
EN Threshold
EN Leakage Current
ΔVOVL = VOVL - VFB
VEN -40℃ ≦ TA 85
IEN
60 mV
0.3 0.45 1.30
V
±0.1 ±1
μA
YB1680 Rev.1.0
www.yobon.com.tw
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